code: def test_layer_getters(self):
      # Test mixing ops and layers
      input_a = Input(shape=(3,), batch_size=2, name="input_a")
      input_b = Input(shape=(3,), batch_size=2, name="input_b")
      x = input_a + input_b
      x = layers.Dense(5, name="dense_1")(x)
      outputs = layers.Dense(4, name="dense_2")(x)
      model = Functional([input_a, input_b], outputs)
  
      self.assertEqual(len(model.layers), 4)
      self.assertEqual(len(model._operations), 5)
      self.assertEqual(model.get_layer(index=0).name, "input_a")
      self.assertEqual(model.get_layer(index=1).name, "input_b")
      self.assertEqual(model.get_layer(index=2).name, "dense_1")
      self.assertEqual(model.get_layer(index=3).name, "dense_2")
      self.assertEqual(model.get_layer(name="dense_1").name, "dense_1")
  
imports: import warnings
  import numpy
  import pytest
  from keras import backend
  from keras import layers
  from keras import testing
  from keras.layers.core.input_layer import Input
  from keras.layers.input_spec import InputSpec
  from keras.models import Functional
  from keras.models import Model
label_desc: Use image node_id 8 for calling the FunctionalTest obj's underlying member method code with example usage: obj.test_layer_getters() without return types